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EEA/ELRALoad Curtailment

JarreauCycle 4

2010

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Objectives

Discuss and describe each NERC EEA. Dispatchers will be able to identify the proper

EEA and ELRAL to use for different situations. Describe the difference between a projected

shortfall and dynamic shortfall and the steps to mitigate each.

Describe the difference between a System Wide shortfall vs. local shortfall.

Perform actual drills with a set of given conditions

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References

NERC– http://www.nerc.com/~filez/standards/Reliability_Standards_Regulat

ory_Approved.html– Standard EOP-002-2 — Capacity and Energy

Emergencies– Standard EOP-003-1 — Load Shedding Plans

Current Day Procedures– EMO/SPO Current Day Procedure 2.1 Curtailment Process

Transmission Business Procedure “Curtailment Process”

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Dynamic Shortfall (attachment 7)

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Energy Emergency Alert (EEA)

For clarification during a potential and actual energy emergency, NERC established four levels of Energy Emergency Alerts.– EEA 1 — All available resources in use.– EEA 2 — Load management procedures in effect.– EEA 3 — Firm load interruption imminent or in progress.– EEA 0 – Termination.

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Entergy Load Curtailment Procedure

Dynamic Shortfall - A Dynamic Shortfall is an unanticipated shortage of supply that is immediate or anticipated to occur within less than ten minutes.

Projected Shortfall - A Projected Shortfall is a shortage of supply anticipated to occur more than ten minutes in the future. Projected Shortfalls can become Dynamic Shortfalls if System conditions suddenly worsen.

Systemwide Shortfall - A Systemwide Shortfall is a shortage of supply that can be relieved by curtailing load anywhere on the System. In SystemwideShortfalls, all loads are eligible for curtailment in accordance with the general curtailment priorities.

Local Shortfall - A Local Shortfall is a shortage of supply in a local area that would cause line overloads or low voltage problems in that area. Only the curtailment of demand in that area can relieve these problems. In Local Shortfalls, certain local loads are subject to curtailment, while loads elsewhere in the Entergy System will not be subject to curtailment, sincecurtailing those loads would not relieve the local problems.

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Entergy Load Risk Alert Protocols (ELRAL).

Establishes a “common language” to quickly and efficiently inform Entergy key management of the criticality of any load risk situation.

Develops a Native Load Buffer risk indicator. Provides EOS/EMO to declare Load Risk Alert Levels. Provides for activation of the System Command Center when native

load is at risk. Provides highly coordinated communications with proactive e-mail

and pager alerts providing consistent and timely information to all key management.

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High Level Description Matrix

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Table of Interruptible Loads/Sales

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Entergy Operating Subcommittee (EOS)

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Firm Load Curtailment Allocation Worksheet

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Curtailment/Interruptible Amount Summary

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Drill Scenario 1

Given a set of conditions please determine a plan of action and discuss with class:– Date: 07/23/2010– Time: 16:30– GA1 trips at full load leaving current reserve at

-200 reserves– Once you call for RSS coverage for GA1 then

Grand Gulf trips What would be some of your actions and the

developed plan to and what is your actions?

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Drill Scenario 2

Given a set of conditions please determine a plan of action and discuss with class:– Date: 07/15/2010– Time: 16:30– WF3 trips at full load leaving current reserve at

-800 reserves What is the plan and what is your actions?

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Review

Discussed and describe each NERC EEA. Defined the term “energy deficient entity” as

described by the NERC Standard. Discussed EEA and ELRAL levels. Described the difference between a projected

shortfall and dynamic shortfall and the steps to mitigate each.

Described the difference between a System Wide shortfall vs. local shortfall.

Discussed key steps in curtailment process. Performed drills